Fixture for grinding tools



5 Sheets- Sheet 1 Filed June 9, 1965 INVENTOR 'Auguo'fo M rlmzs+s ATTORNEY April 9, 1968 A. M. ERNESTO 3,376,674

FIXTURE FOR GRINDING TOOLS Filed June 9, 1965 I 5 Sheets-Sheet 2 f/ F/GJ I I yuw ATTORNEY April 9, 1968 A. M. ERNESTO FIXTURE FOR GRINDING TOOLS 5 Sheets-Sheet 3 Filed Jung: 9, 1965 MICRO/METER FIG. 7

ATTORNEY April 9, 1968 A. M. ERNESTO 3,376,674

FIXTURE FOR GRINDING TOOLS Filed June 9, 1965 5 Sheets-Sheet 4 MA GNE 77C C HUCA y gek/ g A 7' TORNE V Aprii 9, 1968 A. M. ERNESTO FIXTURE FOR GRINDING TOOLS 5 Sheets-Sheet 5 Filed June 9, 1965 MAGNET/C CHUCK FIG. /.3C

lNVENTOl? zlqalp/b 7 8 rnes-{e BV ATTORNEY Unite 3,376,674 Patented Apr. 9, 1968 3,376,674 FIXTURE FOR GRINDING TOOLS Augusto M. Ernesto, 68 Watchung Ave, West Orange, NJ. 07052 Filed June 9, 1965, Ser. No. 462,648 1 Claim. (Cl. 51-217) ABSTRACT OF THE DISCLOSURE spaced from each other longitudinally of the bar from the smooth-walled bore toward an end of the bar, a pin member engaging both bores with the bar being rotatably pivoted on the plate by means of the pin, a tool clamping block member mounted on said bar for slidable movement longitudinally of the bar, said clamping block being bifurcated at one end portion thereof and having a tool retaining yoke at the opposite end portion thereof, and clamping block retaining means seated in said bifurcated end portion and engaging one of said threaded bores.

Punches and tools are usually formed from suitable lengths of specially made and treated tool steels such as cobalt, carbide, etc. The sides and ends of the lengths of tool steel are usually ground down to precise and exact measurements to provide cutting edges, and if desired a flat face may be formed at the front of the tool bit or punch and the sides may be ground to provide a desired configuration.

Normally, lengths of tool steel are held in tool holders or fixtures while they :are being worked upon to assure the proper angle and configuration and also to assure the precise dimension of the tool or bit.

The cutting edges of the punch or tool are, of course, essential for the proper operation of the tool when used in conjunction with its mating die or when it is used with other precision tools.

In the instance of punches, it may be necessary to grind several different angles on a punch and it is essential that each angle be precise and exact and in proper relation with other angles and surfaces on the die.

Fixtures in common use today attempt to provide securing means for grinding tools and punches to precise measurements but most of them have fallen far short of their requirements and those that are satisfactory are very complicated and expensive, and are constructed so that they must be carefully and manually adjusted in order to be ground to the proper shape.

It is the purpose of the present invention to provide a universal punch or tool holding fixture which may readily be indexed to precise dimensions, whereby the tool to be worked upon may be easily and readily positioned to be ground into shapes, which are exact in their dimensions and have their cutting edges and configuration in exact conformation as required both with respect to the body of the tool itself and the relation between the various angles involved.

It is the purpose of this invention to provide a grinding fixture for holding punches and tools in their proper position for grinding which may be easily mounted and may be quickly and accurately set to hold the tool or punch in various positions so that it may be readily ground to a predetermined shape or size.

A feature of the present invention is the provision of a tool or punch holding fixture by means of which tools or punches may be accurately positioned therein relative to a grinding wheel whereby the various faces of the punch or tool may be ground without the necessity of any complicated changes or adjustments of the punch or tool during the grinding operation.

Other purposes :and features of the present invention will be readily apparent from the following detailed description when read with reference to the following drawings, in which,

FIGURE 1 is a view in perspective of the fixture of this invention with a punch, in dot and dash positioned therein.

FIGURE 2 is an exploded view of FIGURE 1.

FIGURE 3 is a view in perspective showing, the V- Block holding member, which forms part of the assembly, in position on a magnetic chuck, with the punch being worked upon the grinding wheel, and the chuck being shown in dot and dash.

' FIGURE 4A illustrates the worked upon.

FIGURE 4B illustrates the punch blank with one flat ground thereon.

FIGURE 4C illustrates the thereon.

FIGURE 5 is a view in punch blank before being punch with two flats ground perspective showing the V- Block holding fixture secured in position on its mounting plate, with a JO-Block, positioning it accurately forv riadial grinding of the punch which is shown in dot and ash.

FIGURE 6 is a view similar to FIGURE 5 except that a micrometer is used for accurately positioning the V- Block holding fixture.

FIGURE 7 is a perspective view similar to FIGURE 1, but with the V-Block in position on its adjustable mounting plate, so that it pivots, to provide accurate grinding of 180 radii on the sides of the punch as shown.

FIGURE 8 is a top plan view of the punch, after it is ground as shown in FIGURE 7.

FIGURE 9 is a perspective view of a modified form of the invention with the V-Block holding fixture, positioned on an octagonal mounting plate, which is adjustable with respect thereto.

FIGURE 10 is an exploded view of the assembly shown in FIGURE 9.

FIGURE 11 is a view in perspective of the assembly shown in FIGURES 9 and 10, positioned on an adjustable magnetic chuck, shown in dot and dash, with a punch secured in position in the V-Block holding fixture, and being worked upon by the grinding Wheel, which is also shown in dot and dash.

FIGURE 12 is a view in perspective of the fixture shown in FIGURES 9, 10 and 11 mounted on an angle plate, in vertical position, with respect to the magnetic chuck, thereby permitting the assembly to be positioned in such a manner that flats of varying configurations may be ground, by rotating the assembly.

FIGURE 13A is a punch blank which is adapted to be positioned in the fixture as shown in FIGURES 9, 10, 11 and 12, before being worked upon.

FIGURE 13B is a punch which has been ground with four flats, at right angles to each other.

FIGURE 130 is a punch which has been accurately ground to hexagonal shape, by the fixture above.

In the preferred embodiment of my invention as shown in FIGURES 1, 2, 3, 5, 6 and 7, the tool holding or securing fixture comprises a base member 10, a mounting plate 11 and a tool securing member 12. As shown in the various figures, and more in particular in FIGURE 2, the base member comprises a fiat extremely accurately dimensioned steel member 10, having centrally located therein and projecting upwardly a pin 13, which is adapted to, engage the aperture 14 in the mounting plate 11 to permit radial movement thereof. In order to facilitate theaccurate positioning of the member 11, projecting stop pins ,15 and 16, which extend outwardly therefrom are provided- The mounting plate 11, is provided with a plurality of alignedthreaded apertures 17 which are adapted to be engaged by the locking screw 18 to position, adjustably, the tool holding member 12 in place thereon, and permit its lateral movement thereon and the locking of it in place. As. shown a removable pin 19 is provided which is adapted to engage, when required, the pins and 16, to index the member 11, when it is rotated on the pin 13.

Extending outwardly from each end of the member 11 are the knurled finger holds 20 and.21, which facilitate the rotation or movement of the member 11 when it is in position for working on a tool or punch.

The tool or punch'holding fixture comprises a recessed block member having a bifurcated end portion 22, thru which the locking screw 18 extends and engages a selected threaded aperture 17 in the member 11. An accurately machined channel 23 is provided on the bottomof the member 11, which, embraces the sides and upper face of the member 11.

Located on the opposite end of the member 11, and centrally disposed thereto is a V-shaped recess 24, which is adapted to receive the tool or punch 25. The punch 25 is firmly held in place by means of a set screw 26 in the yoke 27, which engages a flaton the shank portion of the punch 25.

From the foregoing it will be readily observed that, fine and accurate adjustments may be made between the article being worked upon, for example the punch 25, and the grinding wheel or other member it is brought into contact with, since the holding fixture 12 may be located with respect to the mounting, plate 11, and the whole positioned on the base 10 and accurately rotated with respect thereto.

In the disclosure in FIGURE 3, I have shown the tool holding fixture 12 disassembled from its assembly, as heretofore described, and mounted on a magnetic chuck 28, which is provided withan accurate and square upstanding rear edge 29. In this structure the tool or punch being worked upon is in a horizontalposition and may be fed laterally or crosswise sociated with chucks of this type, into 30, in the usual manner.

The punches as shown in FIGURES 4A, 4B ancl4C are provided with flats 31, as heretofore described for holding them in place. These; three figures illustrate the three stages in the development of the punch as shown, 4A, the blank, 4B, one face ground, and 4C the finished punch,

In FIGURE 5 the tool holding fixture 12 is shown as accurately being positioned on the plate 11 by means of a Jo-Block 32 which is interposed between the locating pin 19, and the inside. surface or bifurcated portion 22 of the. tool fixture 12.

This structure provides an extremely accurate method of positioning the tool or punch, being worked upon, with respectzto the grinding wheel.

The structure shown in FIGURE 6 is substantially the same as that shown in FIGURE 5, and the description with respect tothat figure applies 'here, except, that in place of the JO-Block32 for positioning the tool holding fixture 12,.1 employ a micrometer 33.

In FIGURE 7, I have shown the fixture of my invention being used to accurately grinda radius as shown at 34 in FIGURE 8 on the edge or side of the punch 25.

the gridin g wheel by the usual mechanism asr 4- For this operation I mount the base 10 on a suitable magnetic chuck 28 with the fiat edge of the member 10 in firm engagement with the rear edge 24, as shown.

The mounting plate 11 is then positioned over the pin 13 with its aperture 14 in engagement therewith, thus.

permitting the plate 11 to freely rotate thereon. The next step is to position the punch 25in the fitxure 12 in the desired position and secure it by means of the set screw 26. The tool holding fixture 12 is then positioned on the member 11 and locked in place by means of the set screw 18, as heretofore described. With the assembled structure as described, the tool holder may be rotated about the pivot pin 13, which will cause the side of the punch 25 to pass over the face of the wheel 30 in a prescribed arc and will be limited in its rotation by means of the pin 19 engaging the stop pins 15 and 16, thus an accurate and precise arcuate face is ground on the punch 25.

In the modification of my invention as shown in FIG- URES 9, 10, 11 and 12, I have provided a mounting plate 34 of octagonal configuration, each face of which is accurately ground, so that the flat faces are parallel and are square with each other. The edgesof the plate 34 each comprise a 45 angle and are precision ground to very close limits. Located in the exact center of the plate 34 is an aperture 35 which is adapted to accommodate the pin 36. Extending outwardly from the aperture 35 are the threaded radially directed apertures 37 for securing the tool holding fixture 12 thereto. The fixture 12 is secured to the plate 34 by means of the set screw 18.

in a manner as heretofore described. As shown suitable removable pins 38 and 39 extend outwardly frornthe sides of the member 34.

In FIGURE 11 I have shown the application ofthe structure as above described, wherein the punch 25 is held in position in the yoke 27 by means of the screw 26, with its bottom edge bearing against the top of the pin 36. The length of the pin 36 may be varied to suit various conditions with regard to length of punch. As shown the assembly is held in a position with respect to the grinding wheel 30 on. a magnetic chuck 28, of well known construction.

In FIGURE 12 I have shown the structure of FIG- URES 9, 10 and 11 positioned to present the tool or punch 25 horizontally to the wheel 30. In this figure the plate 34 is mounted on its edge, and backed up against an angle plate 40, shown in dot and dash; the angle plate 40 and the .plate 34 are held in place by the electric forces exerted by the magnetic chuck 28, and permit a very flexible arrangement whereby the plate 34 may be rotated and positioned on any one or any combination of faces to grind a punch or tool as shown in FIGURES 13A, 13B and 13C.

Therefore, the invention comprises a fixture for holding a tool in juxtaposition with respect to a grinding wheel, comprising a flat-surfaced metal plate having a series of flat sides adjacentone to another perimetrically defining a polygon, a smooth-walled bore located .centra'lly of the plate, each other radially of the plate from the central bore to a point bisecting one of the flat sides, a tool clamping block member mounted on said plate, said clamping block 1 member being bifurcated at one end portion thereo'f and having a tool retaining yoke at the opposite end portion thereof, a pin member disposed in said central bore, and engaging said yoke, and clamping block retaining means seated in said bifurcated end portion and engaging one of said threaded bores.

More specifically the invention comprises a fixture for holding a tool in juxtaposition with respect to a grinding wheel, comprising a fiat-surfaced metal plate having a.

series of fiat sides adjacent one to another perimetrically defining a polygon, a smooth-walled bore located centrally of the plate, an elongated mounting bar having a smooth-walled bore intermediate the ends thereof, a series of threadedvbores in said bar spaced from each other a series of threaded bores spaced from i longitudinally of the bar from said smooth-walled bore toward an end of the bar, a pin member engaging both smooth-Walled bores, a tool clamping block member mounted on said bar for slidable movement longitudinally of the bar, said clamping block being bifurcated at one end portion thereof and having a tool retaining yoke at the opposite end portion thereof, and clamping block retaining means seated in said bifurcated end portion and engaging one of said threaded bores.

While I have shown and described the preferred embodiment of my invention it is to be understood that various changes and modifications may be made therein, Without departing from the spirit of the invention.

What is claimed is:

1. A fixture for holding a tool in juxtaposition with respect to a grinding wheel, comprising a flat-surfaced metal plate having a smooth-walled bore located centrally thereof, an elongated bar having a smooth-walled bore intermediate the ends thereof, a series of threaded bores in said bar spaced from each other longitudinally of the bar from said smooth-walled bore in said bar toward an end of the bar, a second smooth-Walled bore in said bar located at an end portion thereof, finger gripping means on each opposite end of the bar and extending longitudinally outwardly at the bar in opposite directions, a. plurality of stop means extending diametrically outwardly of the plate, a first pin member engaging the smooth- Walled bore in the plate and the first-mentioned smooth- Walled bore in said bar, said first pin being a pivot pin permitting a rotary movement of the bar relative to the plate, a second pin mounted through said second smoothwalled bore in said bar and engageable with said stop means upon rotation of said bar, a tool clamiping block member mounted on said bar for slidable movement, said bar having an undercut channel in its lower surface and formed longitudinally of the block member, said undercut surface engaging the top surface of the bar, said clamping member being bifurcated at one end portion thereof and having a tool retaining yoke at the opposite end portion thereof, and clamping block retaining means seated in said bifurcated portion and engaging one of said threaded bores.

References Cited UNITED STATES PATENTS 2,297,306 9/ 1942 Kousin 51216 2,454,472 11/ 1948 M'onkley 5 l124 2,785,518 3/1957 Brown 51220 2,822,649 2/1958 B'ruderick 51-220 3,107,462 10/ 1963 Bryniarski 51221 HAROLD D. WHITEHEAD, Primary Examiner. 

